Relationship between soluble sugar content and insect resistance of target tree species infected by Hyphantria cunea（Drury）

In September 2014，the experiment of factitious infection by Hyphantria cunea（Drury） （Lepidoptera：Arctiidae）was carried out in three-year woodland of target tree species，including Fraxinus chinensis Rosb.，Platanus orientalis L.，Morus alba L.，Ailanthus altissima（Mill.）Swingle，Populus tomentosa Carr.，Toona sinensis（A. Juss.）Roem in Langfang City. The larvae of H. cunea were reared on leaves of the target species under laboratory conditions，and their leave consumption and changes of soluble sugar content of target tree species before and after factitious infection by H. cunea were measured and compared. The results indicated that the order of leave consumption by H. cunea arranged as M. alba ＞ P. orientalis ＞ A. altissima. ＞ F. chinensis ＞ P. tomentosa ＞ T. sinensis. There was no regularity of change of soluble sugar content in target tree species（tolerant and susceptible to the moths）. The results demonstrated that the resistance to H. cunea was insignificantly correlated with soluble sugar content.